I love how good everyone look in the Zozotown collab, especially Yoshiki. His outfit reminds me of this other official art, it's probably the key chain (I have no idea where this art comes from, but I love his outfit).
I feel once he'll be finally able to move in Tokyo he'll be more into fashion, I mean...
...my boy cannot be really that indifferent to fashion if he wants to look all nice to see "Hikaru" again and he thinks, with a bit of resignation, that his best outfit is his school uniform, on which he had 0 agency on, since it's literally a standard for every student.
From a volume 2 extra, it seems to me that he's kind of sad/resigned that he can't really wear nothing nice since it's useless being stylish in the middle of the nowhere in the countryside (and I can't blame him, especially when in the village everyone is quick to criticize everyone for everything and we know Yoshiki suffers from that)
My boy Yoshiki will be so happy to experiment with fashion when he'll be in Tokyo and "Hikaru" will be so supportive. Viceversa is also valid, "Hikaru" imho will have to unlearn to hate himself (he's really in a bad place rn, physically and psychologically) and he will find his own self, like he is already realizing (the beach scenes, when for the first time it's not Yoshiki telling him how different he his from Hikaru, but it's "Hikaru" himself pointing out their differences)